Transmission for engines



A. L. POWELL.

YRANSMISSION FOR ENGINES.

APPLICATION men mac. 8, 1920.

1,384,842. Patented y 12, 1921.

---- [In-mi lm g @l M L B6 2 2 UNITED STATES,

PATENT OFFICE.

ALVAH L. POWELL, OF MILES CITY, MONTANA, ASSIGNOR TO THE A. I1. POWELL POWER (30., OF MILES CITY, MONTANA, A CORPORATION.

TRANSMISSION FOR ENGINES.

Specification of Letters latent. Patented J uly 12, 1921,

Application filed. December 8, 1920. Serial No. 429,176.

To all whom'z't may concern Be it known that I, ALVAH L. POWELL, citizen of the United States, residin at Miles City, in the county of Custer and gtate of Montana, have invented certain new and useful Improvements in Transmission for Engines, of which the following is a specification.

My invention relates to improvements in the transmitting member of engines, by which I secure a variation in the movement of the piston with reference to that of the crank, enabling me to gain advantages in the operation of such'engines that are not possible with the constructions at present used. This application is one of a series, filed with it, bearing Serial Numbers 429,168; 429,170, to 429,175, inclusive, and covers improvements over the forms therein shown, for, while the general principles are the same, the construction herein described includes a novel arrangement having advan tages peculiar to itself.

In my prior application I have shown transmitting means embracing a slotted yoke, and rollers acting on eccentrically disposed crank levers, the latter partially rotating by reason of the thrust of eccentric rollers in the slotted yoke. In my present application I compensate for the angularity of movement of the toothed connectingrod by other means, and it is to this improvement that I confine my description; In the annexed drawing-- Figure 1 is an elevation, showing my invention attached to the piston of an engine,

preferably of the internal combustion type. K

Fig. 2 is a sectional plan, showing the arrangement of the segmental pinions ontheir supporting pins.

The slotted yoke D is attached to the piston A by a rod, A that may be integral "with the aforesaid yoke, or be formed of a separate piece. The slot engages rollers, A A mounted on pins, B B on crank levers B, B, the latter keyed to pins 13 ,33

preferablymounted in the engine frame,

The said pins B B also carryfsegmental pinions, E, E, keyed thereto. On the pins B B are mounted smaller segmental pinions, 13, 13 Of these, the pinion B is keyed to its pin, the pinion B being freely rota-table. The loose pinion B is held in position by a collar E Fig. 2.

From a crank on an engine shaft there is conventionally attached a crank rod, B

toothed at its upper end (as shown in drawing) the teeth meshing with the segmental pinions B", B These pinions are eccentrically set on the pins B 13 On the downstroke of the piston A, the motion will be transmitted to the crank levers, by the action of the slotted yoke and rollers therein. This will cause the larger segmental pinions E, E, to move, partly rotating the pins B B The smaller segmental pinions being in engagement with the rack end of the crank rod, 13, this will also move downward, causing the crank shaft to revolve. Normally, as the crank advances, the crank rod would assume an angle other than that given in the drawing, and its position with reference to the segmental pinions engaged with it would alter; that is, the distance between the radii of the pitch circles of the segmental pinions and of the rack would vary, but as the said segmental pinions are eccentrically mounted on the pins B B they will adjust themselves to this varia tion, the thrust of the slotted yoke being evenly transmitted to the crank rod. It is evident, however, that the positive work will be done by the segmental pinion B, for the reason that it is keyed to its pin, B The segmental pinion B, not keyed, and having an independent and free movement, will act as a supporting means, to hold the crank rod B in proper relation to the posi tive segmental pinion B.

lVhat I believe is new and ask to have protected by Letters Patent, is-

In a differential transmission member, the

combination of pins, rocking levers mounted on said pins and keyed thereto, rollers on said levers, a yoke, slotted forks supported by said yoke, means for engaging the said rollers in the slots of said slotted forks, a

tical connecting rod, a loose pinion mounted I opposite to thebefore mentioned pinion and meshing with the teeth on the vertical connecting rod, segmental pinions on sald plns,

meshing with each other, and a wrist pin holding the crank rod to the crank of an engine shaft, as hereinbefore described.

In testimony whereof I affix my signature.

ALVAI-I L. POWELL. 

